Robinson Edge Detector
Robinson Mask Values
Dy
1
2
1
0
0
0
-1
-2
-1
D(45)
2
1
0
1
0
-1
0
-1
-2
Dx
1
0
-1
2
0
-2
1
0
-1
D(135)
0
-1
-2
1
0
-1
2
1
0
Some more points
Magnitude is simply the maximum of the responses
Angle of the edge is approximately the angle of the zeroes
These approximations save time, but reduce accuracy